CALCULATIONS
PerkinElmer Life and Analytical Sciences 187
Radionuclide Decay Calculator
The Radionuclide Decay calculator allows you to conveniently calculate the
Current DPM Activity for common nuclides.
Figure 10-2 Radionuclide Decay Calculator
% Reference (% Ref)
This value represents the percent of a reference standard and is calculated using
the CPM of the unknown sample and the CPM of the reference standard. The
reference standard is typically the first vial counted in the assay, unless the first
vial is being used to measure background. In this case, the second vial is used as
the reference standard.
100 x
CPM
CPM
%Ref
reference
sample
=
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